Merge pull request #7371 from notnotse/vt-missing-api-annotation

Add @api annotation to ol.VectorTile.getExtent

src/ol/vectortile.js

@@ -92,6 +92,7 @@ ol.VectorTile.prototype.disposeInternal = function() {
 /**
  * Gets the extent of the vector tile.
  * @return {ol.Extent} The extent.
+ * @api
  */
 ol.VectorTile.prototype.getExtent = function() {
   return this.extent_ || ol.VectorTile.DEFAULT_EXTENT;